Make `make install' work with CMake.
Make `make install' work with CMake.

Change-Id: Ie5dd1ac1cea3371e354bc190ff94bd235bd52f15
Reviewed-on: https://code-review.googlesource.com/6911
Reviewed-by: Paul Wankadia <62d4e38bb1380f055ec4b899baa75e52af09c5f7@google.com>

google/re2,google/re2,google/re2,google/re2,google/re2